[Bug 2056716] Re: To support AMD Adaptive Backlight Management (ABM) for power profiles daemon >= 2.0

This bug is awaiting verification that the linux-
nvidia-6.8/6.8.0-1008.8~22.04.1 kernel in -proposed solves the problem.
Please test the kernel and update this bug with the results. If the
problem is solved, change the tag 'verification-needed-jammy-linux-
nvidia-6.8' to 'verification-done-jammy-linux-nvidia-6.8'. If the
problem still exists, change the tag 'verification-needed-jammy-linux-
nvidia-6.8' to 'verification-failed-jammy-linux-nvidia-6.8'.


If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.


See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: kernel-spammed-jammy-linux-nvidia-6.8-v2 verification-needed-jammy-linux-nvidia-6.8

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https://bugs.launchpad.net/bugs/2056716

Title:
To support AMD Adaptive Backlight Management (ABM) for power profiles
daemon >= 2.0

Status in HWE Next:
New
Status in linux package in Ubuntu:
Invalid
Status in linux source package in Noble:
Fix Released

Bug description:
[SRU Justification]

[Impact]

power-profiles-daemon >= 2.0 now utilizes AMD GPU panel_power_savings
sysfs entry to set desired panel power saving level. Related kernel
fixes are to be released in v6.9.

[Fix]

Two linux-next committed fixes are required. The first one introduces
panel_power_savings sysfs entry itself, and the second one extends
abmlevel sysfs entry to allow an auto mode.

[Test Case]

1. Check existence of panel_power_savings sysfs entry:

$ cat /sys/class/drm/card0-eDP-1/amdgpu/panel_power_savings
-1

2. Remove power cable and switch between power profiles from Power
Management settings. The content of above panel_power_savings sysfs
entry should be updated correspondingly.

[Where problems could occur]

While the abmlevel entry now has a different default value that allows
automatic power management, the behavior may differ from users'
expectation.

[Other Info]

power-profiles-daemon >= 0.20 is only available on Noble or later at
this moment, so only Noble/Unstable will be nominated for fix.

========== original bug report ==========

Required kernel fixes (in linux-next):
* https://gitlab.freedesktop.org/agd5f/linux/-/commit/63d0b87213a0ba241b3fcfba3fe7b0aed0cd1cc5
* https://gitlab.freedesktop.org/agd5f/linux/-/commit/040fdcde288a2830edc31dd507963d6aadf990d2

See also power-profiles-daemon merge request
https://gitlab.freedesktop.org/upower/power-profiles-
daemon/-/merge_requests/137

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